1 /* vi: set sw=4 ts=4: */
3 * Mini syslogd implementation for busybox
5 * Copyright (C) 1999,2000 by Lineo, inc.
6 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
8 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
38 #include <sys/socket.h>
40 #include <sys/types.h>
42 #include <sys/param.h>
44 #if ! defined __GLIBC__ && ! defined __UCLIBC__
46 typedef unsigned int socklen_t;
49 # define __NR_klogctl __NR_syslog
50 static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
52 #define klogctl syslog
56 # include <sys/klog.h>
61 /* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
63 #include <sys/syslog.h>
65 /* Path for the file where all log messages are written */
66 #define __LOG_FILE "/var/log/messages"
68 /* Path to the unix socket */
69 char lfile[BUFSIZ] = "";
71 static char *logFilePath = __LOG_FILE;
73 /* interval between marks in seconds */
74 static int MarkInterval = 20 * 60;
76 /* localhost's name */
77 static char LocalHostName[32];
79 static const char syslogd_usage[] =
80 "syslogd [OPTION]...\n"
81 #ifndef BB_FEATURE_TRIVIAL_HELP
82 "\nLinux system and kernel (provides klogd) logging utility.\n"
83 "Note that this version of syslogd/klogd ignores /etc/syslog.conf.\n\n"
85 "\t-m NUM\t\tInterval between MARK lines (default=20min, 0=off)\n"
86 "\t-n\t\tRun as a foreground process\n"
87 #ifdef BB_FEATURE_KLOGD
88 "\t-K\t\tDo not start up the klogd process\n"
90 "\t-O FILE\t\tUse an alternate log file (default=/var/log/messages)\n"
94 /* Note: There is also a function called "message()" in init.c */
95 /* Print a message to the log file. */
96 static void message (char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
97 static void message (char *fmt, ...)
103 fl.l_whence = SEEK_SET;
107 if ((fd = device_open (logFilePath,
108 O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND |
111 fcntl (fd, F_SETLKW, &fl);
112 va_start (arguments, fmt);
113 vdprintf (fd, fmt, arguments);
116 fcntl (fd, F_SETLKW, &fl);
119 /* Always send console messages to /dev/console so people will see them. */
120 if ((fd = device_open (_PATH_CONSOLE,
121 O_WRONLY | O_NOCTTY | O_NONBLOCK)) >= 0) {
122 va_start (arguments, fmt);
123 vdprintf (fd, fmt, arguments);
127 fprintf (stderr, "Bummer, can't print: ");
128 va_start (arguments, fmt);
129 vfprintf (stderr, fmt, arguments);
136 static void logMessage (int pri, char *msg)
140 static char res[20] = "";
144 for (c_fac = facilitynames;
145 c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri) << 3); c_fac++);
146 for (c_pri = prioritynames;
147 c_pri->c_name && !(c_pri->c_val == LOG_PRI(pri)); c_pri++);
148 if (*c_fac->c_name == '\0' || *c_pri->c_name == '\0')
149 snprintf(res, sizeof(res), "<%d>", pri);
151 snprintf(res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
154 if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
155 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') {
157 timestamp = ctime(&now) + 4;
158 timestamp[15] = '\0';
161 timestamp[15] = '\0';
165 /* todo: supress duplicates */
167 /* now spew out the message to wherever it is supposed to go */
168 message("%s %s %s %s\n", timestamp, LocalHostName, res, msg);
171 static void quit_signal(int sig)
173 logMessage(0, "System log daemon exiting.");
178 static void domark(int sig)
180 if (MarkInterval > 0) {
181 logMessage(LOG_SYSLOG | LOG_INFO, "-- MARK --");
187 static int serveConnection (int conn)
189 char buf[ BUFSIZE + 1 ];
192 while ((n_read = read (conn, buf, BUFSIZE )) > 0) {
194 int pri = (LOG_USER | LOG_NOTICE);
195 char line[ BUFSIZE + 1 ];
198 char *p = buf, *q = line;
200 buf[ n_read - 1 ] = '\0';
202 while (p && (c = *p) && q < &line[ sizeof (line) - 1 ]) {
204 /* Parse the magic priority number. */
206 while (isdigit (*(++p))) {
207 pri = 10 * pri + (*p - '0');
209 if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
210 pri = (LOG_USER | LOG_NOTICE);
211 } else if (c == '\n') {
213 } else if (iscntrl (c) && (c < 0177)) {
223 logMessage (pri, line);
228 static void doSyslogd (void) __attribute__ ((noreturn));
229 static void doSyslogd (void)
231 struct sockaddr_un sunx;
232 socklen_t addrLength;
240 /* Set up signal handlers. */
241 signal (SIGINT, quit_signal);
242 signal (SIGTERM, quit_signal);
243 signal (SIGQUIT, quit_signal);
244 signal (SIGHUP, SIG_IGN);
245 signal (SIGCLD, SIG_IGN);
246 signal (SIGALRM, domark);
247 alarm (MarkInterval);
249 /* Create the syslog file so realpath() can work. */
250 close (open (_PATH_LOG, O_RDWR | O_CREAT, 0644));
251 if (realpath (_PATH_LOG, lfile) == NULL)
252 fatalError ("Could not resolv path to " _PATH_LOG ": %s\n", strerror (errno));
256 memset (&sunx, 0, sizeof (sunx));
257 sunx.sun_family = AF_UNIX;
258 strncpy (sunx.sun_path, lfile, sizeof (sunx.sun_path));
259 if ((sock_fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
260 fatalError ("Couldn't obtain descriptor for socket " _PATH_LOG ": %s\n", strerror (errno));
262 addrLength = sizeof (sunx.sun_family) + strlen (sunx.sun_path);
263 if ((bind (sock_fd, (struct sockaddr *) &sunx, addrLength)) || (listen (sock_fd, 5)))
264 fatalError ("Could not connect to socket " _PATH_LOG ": %s\n", strerror (errno));
266 if (chmod (lfile, 0666) < 0)
267 fatalError ("Could not set permission on " _PATH_LOG ": %s\n", strerror (errno));
270 FD_SET (sock_fd, &fds);
272 logMessage (0, "syslogd started: BusyBox v" BB_VER " (" BB_BT ")");
280 memcpy (&readfds, &fds, sizeof (fds));
282 if ((n_ready = select (FD_SETSIZE, &readfds, NULL, NULL, NULL)) < 0) {
283 if (errno == EINTR) continue; /* alarm may have happened. */
284 fatalError ("select error: %s\n", strerror (errno));
287 for (fd = 0; (n_ready > 0) && (fd < FD_SETSIZE); fd++) {
288 if (FD_ISSET (fd, &readfds)) {
297 if ((conn = accept (sock_fd, (struct sockaddr *) &sunx, &addrLength)) < 0) {
298 fatalError ("accept error: %s\n", strerror (errno));
304 perror ("syslogd: fork");
310 serveConnection (conn);
318 #ifdef BB_FEATURE_KLOGD
320 static void klogd_signal(int sig)
324 logMessage(0, "Kernel log daemon exiting.");
328 static void doKlogd (void) __attribute__ ((noreturn));
329 static void doKlogd (void)
331 int priority = LOG_INFO;
332 char log_buffer[4096];
335 /* Set up sig handlers */
336 signal(SIGINT, klogd_signal);
337 signal(SIGKILL, klogd_signal);
338 signal(SIGTERM, klogd_signal);
339 signal(SIGHUP, SIG_IGN);
340 logMessage(0, "klogd started: "
341 "BusyBox v" BB_VER " (" BB_BT ")");
346 /* Use kernel syscalls */
347 memset(log_buffer, '\0', sizeof(log_buffer));
348 if (klogctl(2, log_buffer, sizeof(log_buffer)) < 0) {
353 snprintf(message, 79, "klogd: Error return from sys_sycall: " \
354 "%d - %s.\n", errno, strerror(errno));
355 logMessage(LOG_SYSLOG | LOG_ERR, message);
359 if (*log_buffer == '<') {
360 switch (*(log_buffer + 1)) {
362 priority = LOG_EMERG;
365 priority = LOG_ALERT;
374 priority = LOG_WARNING;
377 priority = LOG_NOTICE;
384 priority = LOG_DEBUG;
388 logMessage(LOG_KERN | priority, logp);
395 static void daemon_init (char **argv, char *dz, void fn (void))
399 strncpy(argv[0], dz, strlen(argv[0]));
404 extern int syslogd_main(int argc, char **argv)
409 #ifdef BB_FEATURE_KLOGD
410 int startKlogd = TRUE;
412 int stopDoingThat = FALSE;
416 while (--argc > 0 && **(++argv1) == '-') {
417 stopDoingThat = FALSE;
418 while (stopDoingThat == FALSE && *(++(*argv1))) {
422 usage(syslogd_usage);
424 MarkInterval = atoi(*(++argv1)) * 60;
429 #ifdef BB_FEATURE_KLOGD
436 usage(syslogd_usage);
438 logFilePath = *(++argv1);
439 stopDoingThat = TRUE;
442 usage(syslogd_usage);
448 usage(syslogd_usage);
450 /* Store away localhost's name before the fork */
451 gethostname(LocalHostName, sizeof(LocalHostName));
452 if ((p = strchr(LocalHostName, '.'))) {
458 #ifdef BB_FEATURE_KLOGD
459 /* Start up the klogd process */
460 if (startKlogd == TRUE) {
462 if (klogd_pid == 0) {
463 daemon_init (argv, "klogd", doKlogd);
468 if (doFork == TRUE) {
473 daemon_init (argv, "syslogd", doSyslogd);
484 c-file-style: "linux"